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Old 08-06-2021, 12:59 AM   #1
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Join Date: Mar 2020
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Lithium Upgrade, new power issue

Hello All. I just upgraded the coach batteries in my Fleetwood Bounder 36FP and I can turn on the inverter. I hear the refrigerator start up, but I have no lights in the cabin. When I start the engine, the lights kick on, but when I turn off the engine, less than a minute goes by and the lights turn off. All while the refrigerator is still running off the batteries.

Is there some change I need to do to get the system to power my coach lights and other 12V systems off my battery that I might be missing? (I checked the breakers and they are not tripped. I assume there isn't a blown fuse as the lights work when the engine is running.

Also, the coach control panel will not boot up off the batteries but will start when the engine is started.

If I cannot get this resolved, will the lights and other stuff work when I am on shore power or will do you think I have this same issue? Thank you.
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Old 08-06-2021, 01:31 AM   #2
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You left off the power wire that goes to the 12 volt house system, or the Use/Store switch is off. It will be a smaller cable then The inverter/charger cable.

The inverter has its own positive and negetive cables. You got them on correctly.
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Old 08-06-2021, 09:00 AM   #3
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Location: FT on the Road
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I do not think it is the battery disconnect switch as twinboat says because things work on shore and alternator power.
Not knowing how you wired things up it's impossible to diagnose.
I did my upgrade to a '16 Bounder and did a lot of research.
My thread on it here:
'16 Bounder Lithium and Solar upgrade
My take on your problem has something to do with the BCC. You'll see a detailed wiring schematic in my post there. Not sure if it is a malfunction of that unit (or components inside of it) or a wiring problem.
Lights inside work on shore power because the converter (not the batteries) is providing 12v power.
Lights inside work when the engine is on because the alternator (not the batteries) is providing 12v power.
Are the lithium/house batteries being charged at all?
I don't make it much on here anymore so will not see your reply to my comment. Drop me a direct message and when I come back on I will see it.
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lithium, power, upgrade

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